/*
 * Copyright (C) 2015 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package retrofit2;

import java.util.Objects;
import javax.annotation.Nullable;

import okhttp3.Headers;
import okhttp3.Protocol;
import okhttp3.Request;
import okhttp3.ResponseBody;

/**
 * Http响应
 * An HTTP response.
 */
public final class Response<T> {
    /**
     * Create a synthetic（综合的） successful response with {@code body} as the deserialized body.
     * 创建一个综合的成功的响应
     * 测试用的啊！！妈的 我说怎么有localhost
     */
    public static <T> Response<T> success(@Nullable T body) {
        return success(
                body,
                new okhttp3.Response.Builder() //
                        .code(200)
                        .message("OK")
                        .protocol(Protocol.HTTP_1_1)
                        .request(new Request.Builder().url("http://localhost/").build())
                        .build());
    }

    /**
     * Create a synthetic successful response with an HTTP status code of {@code code} and {@code
     * body} as the deserialized body.
     * 测试用的
     */
    public static <T> Response<T> success(int code, @Nullable T body) {
        if (code < 200 || code >= 300) {
            throw new IllegalArgumentException("code < 200 or >= 300: " + code);
        }
        return success(
                body,
                new okhttp3.Response.Builder() //
                        .code(code)
                        .message("Response.success()")
                        .protocol(Protocol.HTTP_1_1)
                        .request(new Request.Builder().url("http://localhost/").build())
                        .build());
    }

    /**
     * Create a synthetic successful response using {@code headers} with {@code body} as the
     * deserialized body.
     * 测试用的
     */
    public static <T> Response<T> success(@Nullable T body, Headers headers) {
        Objects.requireNonNull(headers, "headers == null");
        return success(
                body,
                new okhttp3.Response.Builder() //
                        .code(200)
                        .message("OK")
                        .protocol(Protocol.HTTP_1_1)
                        .headers(headers)
                        .request(new Request.Builder().url("http://localhost/").build())
                        .build());
    }

    /**
     * Create a successful response from {@code rawResponse} with {@code body} as the deserialized
     * body.
     */
    public static <T> Response<T> success(@Nullable T body, okhttp3.Response rawResponse) {
        Objects.requireNonNull(rawResponse, "rawResponse == null");
        if (!rawResponse.isSuccessful()) {
            throw new IllegalArgumentException("rawResponse must be successful response");
        }
        return new Response<>(rawResponse, body, null);
    }

    /**
     * Create a synthetic error response with an HTTP status code of {@code code} and {@code body} as
     * the error body.
     */
    public static <T> Response<T> error(int code, ResponseBody body) {
        Objects.requireNonNull(body, "body == null");
        if (code < 400) throw new IllegalArgumentException("code < 400: " + code);
        return error(
                body,
                new okhttp3.Response.Builder() //
                        .body(new OkHttpCall.NoContentResponseBody(body.contentType(), body.contentLength()))
                        .code(code)
                        .message("Response.error()")
                        .protocol(Protocol.HTTP_1_1)
                        .request(new Request.Builder().url("http://localhost/").build())
                        .build());
    }

    /**
     * Create an error response from {@code rawResponse} with {@code body} as the error body.
     */
    public static <T> Response<T> error(ResponseBody body, okhttp3.Response rawResponse) {
        Objects.requireNonNull(body, "body == null");
        Objects.requireNonNull(rawResponse, "rawResponse == null");
        if (rawResponse.isSuccessful()) {
            throw new IllegalArgumentException("rawResponse should not be successful response");
        }
        return new Response<>(rawResponse, null, body);
    }

    private final okhttp3.Response rawResponse;

    private final @Nullable
    T body;

    private final @Nullable
    ResponseBody errorBody;

    private Response(
            okhttp3.Response rawResponse, @Nullable T body, @Nullable ResponseBody errorBody) {
        this.rawResponse = rawResponse;
        this.body = body;
        this.errorBody = errorBody;
    }

    /**
     * The raw response from the HTTP client.
     */
    public okhttp3.Response raw() {
        return rawResponse;
    }

    /**
     * HTTP status code.
     */
    public int code() {
        return rawResponse.code();
    }

    /**
     * HTTP status message or null if unknown.
     */
    public String message() {
        return rawResponse.message();
    }

    /**
     * HTTP headers.
     */
    public Headers headers() {
        return rawResponse.headers();
    }

    /**
     * Returns true if {@link #code()} is in the range [200..300).
     */
    public boolean isSuccessful() {
        return rawResponse.isSuccessful();
    }

    /**
     * The deserialized response body of a {@linkplain #isSuccessful() successful} response.
     */
    public @Nullable
    T body() {
        return body;
    }

    /**
     * The raw response body of an {@linkplain #isSuccessful() unsuccessful} response.
     */
    public @Nullable
    ResponseBody errorBody() {
        return errorBody;
    }

    @Override
    public String toString() {
        return rawResponse.toString();
    }
}
